benchtests/bench-string.h

   1 /* Measure string and memory functions.
   2    Copyright (C) 2013-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/cdefs.h>
  20
  21 typedef struct
  22 {
  23   const char *name;
  24   void (*fn) (void);
  25   long test;
  26 } impl_t;
  27 extern impl_t __start_impls[], __stop_impls[];
  28
  29 #define IMPL(name, test) \
  30   impl_t tst_ ## name                                                   \
  31   __attribute__ ((section ("impls"), aligned (sizeof (void *))))        \
  32        = { __STRING (name), (void (*) (void))name, test };
  33
  34 #ifdef TEST_MAIN
  35
  36 # ifndef _GNU_SOURCE
  37 #  define _GNU_SOURCE
  38 # endif
  39
  40 # undef __USE_STRING_INLINES
  41
  42 # include <stdio.h>
  43 # include <stdlib.h>
  44 # include <string.h>
  45 # include <sys/mman.h>
  46 # include <sys/param.h>
  47 # include <unistd.h>
  48 # include <fcntl.h>
  49 # include <error.h>
  50 # include <errno.h>
  51 # include <time.h>
  52 # include <ifunc-impl-list.h>
  53 # define GL(x) _##x
  54 # define GLRO(x) _##x
  55 # include "bench-timing.h"
  56
  57
  58 # define TEST_FUNCTION test_main ()
  59 # define TIMEOUT (4 * 60)
  60 # define OPT_ITERATIONS 10000
  61 # define OPT_RANDOM 10001
  62 # define OPT_SEED 10002
  63
  64 # define INNER_LOOP_ITERS 64
  65
  66 unsigned char *buf1, *buf2;
  67 int ret, do_srandom;
  68 unsigned int seed;
  69 size_t page_size;
  70
  71 # ifndef ITERATIONS
  72 size_t iterations = 100000;
  73 #  define ITERATIONS_OPTIONS \
  74      { "iterations", required_argument, NULL, OPT_ITERATIONS },
  75 #  define ITERATIONS_PROCESS \
  76      case OPT_ITERATIONS:                                                     \
  77        iterations = strtoul (optarg, NULL, 0);                                \
  78        break;
  79 #  define ITERATIONS iterations
  80 # else
  81 #  define ITERATIONS_OPTIONS
  82 #  define ITERATIONS_PROCESS
  83 # endif
  84
  85 # define CMDLINE_OPTIONS ITERATIONS_OPTIONS \
  86     { "random", no_argument, NULL, OPT_RANDOM },                              \
  87     { "seed", required_argument, NULL, OPT_SEED },
  88 # define CMDLINE_PROCESS ITERATIONS_PROCESS \
  89     case OPT_RANDOM:                                                          \
  90       {                                                                       \
  91         int fdr = open ("/dev/urandom", O_RDONLY);                            \
  92                                                                               \
  93         if (fdr < 0 || read (fdr, &seed, sizeof(seed)) != sizeof (seed))      \
  94           seed = time (NULL);                                                 \
  95         if (fdr >= 0)                                                         \
  96           close (fdr);                                                        \
  97         do_srandom = 1;                                                       \
  98         break;                                                                \
  99       }                                                                       \
 100                                                                               \
 101     case OPT_SEED:                                                            \
 102       seed = strtoul (optarg, NULL, 0);                                       \
 103       do_srandom = 1;                                                         \
 104       break;
 105
 106 # define CALL(impl, ...)        \
 107     (* (proto_t) (impl)->fn) (__VA_ARGS__)
 108
 109 # ifdef TEST_NAME
 110 /* Increase size of FUNC_LIST if assert is triggered at run-time.  */
 111 static struct libc_ifunc_impl func_list[32];
 112 static int func_count;
 113 static int impl_count = -1;
 114 static impl_t *impl_array;
 115
 116 #  define FOR_EACH_IMPL(impl, notall) \
 117      impl_t *impl;                                                            \
 118      int count;                                                               \
 119      if (impl_count == -1)                                                    \
 120        {                                                                      \
 121          impl_count = 0;                                                      \
 122          if (func_count != 0)                                                 \
 123            {                                                                  \
 124              int f;                                                           \
 125              impl_t *skip = NULL, *a;                                         \
 126              for (impl = __start_impls; impl < __stop_impls; ++impl)          \
 127                if (strcmp (impl->name, TEST_NAME) == 0)                       \
 128                  skip = impl;                                                 \
 129                else                                                           \
 130                  impl_count++;                                                \
 131              a = impl_array = malloc ((impl_count + func_count) *             \
 132                                    sizeof (impl_t));                          \
 133              for (impl = __start_impls; impl < __stop_impls; ++impl)          \
 134                if (impl != skip)                                              \
 135                  *a++ = *impl;                                                \
 136              for (f = 0; f < func_count; f++)                                 \
 137                if (func_list[f].usable)                                       \
 138                  {                                                            \
 139                    a->name = func_list[f].name;                               \
 140                    a->fn = func_list[f].fn;                                   \
 141                    a->test = 1;                                               \
 142                    a++;                                                       \
 143                  }                                                            \
 144              impl_count = a - impl_array;                                     \
 145            }                                                                  \
 146          else                                                                 \
 147            {                                                                  \
 148              impl_count = __stop_impls - __start_impls;                       \
 149              impl_array = __start_impls;                                      \
 150            }                                                                  \
 151        }                                                                      \
 152      impl = impl_array;                                                       \
 153      for (count = 0; count < impl_count; ++count, ++impl)                     \
 154        if (!notall || impl->test)
 155 # else /* !TEST_NAME */
 156 #  define FOR_EACH_IMPL(impl, notall) \
 157      for (impl_t *impl = __start_impls; impl < __stop_impls; ++impl)          \
 158        if (!notall || impl->test)
 159 # endif /* !TEST_NAME */
 160
 161 # ifndef BUF1PAGES
 162 #  define BUF1PAGES 1
 163 # endif
 164
 165 static void
 166 test_init (void)
 167 {
 168 # ifdef TEST_NAME
 169   func_count = __libc_ifunc_impl_list (TEST_NAME, func_list,
 170                                        (sizeof func_list
 171                                         / sizeof func_list[0]));
 172 # endif
 173
 174   page_size = 2 * getpagesize ();
 175 # ifdef MIN_PAGE_SIZE
 176   if (page_size < MIN_PAGE_SIZE)
 177     page_size = MIN_PAGE_SIZE;
 178 # endif
 179   buf1 = mmap (0, (BUF1PAGES + 1) * page_size, PROT_READ | PROT_WRITE,
 180                MAP_PRIVATE | MAP_ANON, -1, 0);
 181   if (buf1 == MAP_FAILED)
 182     error (EXIT_FAILURE, errno, "mmap failed");
 183   if (mprotect (buf1 + BUF1PAGES * page_size, page_size, PROT_NONE))
 184     error (EXIT_FAILURE, errno, "mprotect failed");
 185   buf2 = mmap (0, 2 * page_size, PROT_READ | PROT_WRITE,
 186                MAP_PRIVATE | MAP_ANON, -1, 0);
 187   if (buf2 == MAP_FAILED)
 188     error (EXIT_FAILURE, errno, "mmap failed");
 189   if (mprotect (buf2 + page_size, page_size, PROT_NONE))
 190     error (EXIT_FAILURE, errno, "mprotect failed");
 191   if (do_srandom)
 192     {
 193       printf ("Setting seed to 0x%x\n", seed);
 194       srandom (seed);
 195     }
 196
 197   memset (buf1, 0xa5, BUF1PAGES * page_size);
 198   memset (buf2, 0x5a, page_size);
 199 }
 200
 201 #endif /* TEST_MAIN */